While Loop Line Plot??

I am running a while loop to take the average value of a selcted portion of a matrix. My loop selects a fixed amount of rows and sweeps through columns via the while loop. I want to plot these points as a line vs my upper bound(yU), but I can only seem to get a scatter plot. Does anyone know how to do this?

function [avg] = sweep(mat,xL,xU,yL,yU,ystep,ymax)
     
while yU < ymax
     selmat = mat(xL:xU,yL:yU);
     avg = mean(mean(selmat(~isnan(selmat))));
     
     
     plot(yU,avg,'-x')
     hold on

     yL = yL + ystep;
     yU = yU + ystep;
end

end

Answer 1

[Star Strider]

I have no idea what the arguments to your function would be, so I can’t run your code.

Note that this assumes that the calculated values for each element of ‘avg’ and ‘yU’ are scalars.

Try this:

kount = 0;
while yU < ymax
     kount = kount + 1;
     selmat = mat(xL:xU,yL:yU);
     avg(kount) = mean(mean(selmat(~isnan(selmat))));
     yL = yL + ystep;
     yU = yU + ystep;
     yUv(kount) = yU;
end
figure
plot(yUv,avg,'-x')

Make appropriate changes to get the result you want.

[Josh Hanner]

Worked out perfectly! Thanks!

I am running the function within a script that computes the average spl(sound pressure level in dB) for a 3x3 control room. The control room can vary in location anywhere on a 15x15 manufacturing floor, and it is up to me to pick an optimal location where the average spl is at a minimum.

I am basically sweeping a 3x3 grid across this 3-d plot. I'm sure there is a better way to do it, but thanks for the help!

[Star Strider]

As always, my pleasure!

There may be some Image Processing Toolbox functions, such as imfilt, that could be apppropriate. It depends on what you want to do.